Malicious PDF — malware analysis report

Static analysis result for SHA-256 6692be5a443ae9a5…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 06:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f8aa0342191157e5a904bf25d0c1eae6 SHA-1: a873c4c443f18a49a37a0f41b60d810171607b34 SHA-256: 6692be5a443ae9a5f10b5bf25430e4b96cf4ad8d368b5da981cb554351362c13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to a suspicious URL. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=what+are+the+kinds+or+types+of+logical+connectors PDF link annotation
    • http://tryne.xyz/income_statement_analysis_reportcytq9.pdfIn PDF document text
    • http://sallles.ru/uad_apollo_twin_usb_price_in_indiacsjtf.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/jdP9ibu/township_game_online_or_offline.pdfIn PDF document text
    • http://befigter.xyz/belden_cable_selection_guidey8cd4.pdfIn PDF document text
    • http://akvatehnika74.ru/cheap_thrills_320kbpsszdxk.pdfIn PDF document text
    • http://xrootunited.com/14467662552x6jki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5fd8b60b28d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_602b79f431971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fdc43638432f.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/nifgjjf/rotten_teeth_dream_islam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384639/normal_5fff308dd6e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_6011d1f93a587.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/hpUT1ti/selijivotirevegitezudo.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/hjeZYoc/72542427301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_602eada619b61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/21439284898.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/fedufesopiwinazanes.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/dufesinagivuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/bb_z10_android_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/jaligafekizib.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 5596 bytes
SHA-256: 7c7c015e70c392aed21440e6050969be8ff77e4172702b65faa4a7115bd26326
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 11200 bytes
SHA-256: d6a2612038b1ca1405b5c05cbf86b73f15983a03f4ad91125e63f714fef74da4

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